Larger systems, or systems that stack up additional gyros to compare measurements can improve performance further. A fiber-optic gyroscope, or FOG, works using the Sagnac effect, just like a ring ...

as well as a Fiber Optic Gyroscope (FOG) from an unknown missile, though possibly from the Tornado family of MRLSes. The latter uses the Sagnac effect to detect the phase shift between two laser ...